Vintagechef I found them at a couple of places but dirtcheapcasings.com had them at a good price. You may have to call them I just tried their site and it was under construction.But I came up with a recipe and made 6 pounds last spring it came out pretty close to my memory of what it should be but I got a little heavy handed with the pepper. But the bags worked fine I soaked mine a few minutes before filling and that helped. I filled mine right off the grinder.I think Waltons may have the bags too.

Lowes has Poplar And Oak. Some hobby shops carry Maple (good luck finding a hobby shop these days).